I'd like to replace and upgrade the Valve Covers on my 2004 XLT 4.0 ... what are the right choices to look at ? Are there aluminum Valve Covers and are they worth hassle/cost ?
I'm thinking about one of these red diff covers on ebay...anyone have experience or better idea??
Alloy USA 11212 Aluminum Differential Diff Cover Red For Dana 44 Axle (Red)
ARB 0750003 Differential Cover (Red) For Dana 44 Axles
I'm getting a whining/whirring noise under the hood and it varies with speed ... the cooling fan seems ok so should I be thinking Tensioner, A/C bearings, Alternator bearings ... aby idea's ??
My A/C Compressor is Engaged Regardless of Setting on A/C Switch ... the switch on the right side of manual A/C control panel... I caan't just run fan to circulate air without the A/C compressor engaging !
What should I start checking ?